package com.common.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class EncodingFilter implements javax.servlet.Filter {

	protected String encoding = null;

	protected FilterConfig config;

	public void init(FilterConfig filterConfig) throws ServletException {
		this.config = filterConfig;
		// 从web.xml配置文件中获取编码配置
		this.encoding = filterConfig.getInitParameter("encoding");
	}

	public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
		if (request.getCharacterEncoding() == null) {
			String encode = getEncoding();
			if (encode != null) {
				// 设置request的编码方式
				request.setCharacterEncoding(encode);
				response.setCharacterEncoding(encode);
			}
		}
		chain.doFilter(request, response);
	}

	public String getEncoding() {
		return encoding;
	}

	public void destroy() {

	}

}
